Note 5 - Contracts in Progress - Long-term Contracts (Details) - USD ($)	Nov. 30, 2018	Nov. 30, 2017
Costs in Excess of Billings, Cost	$ 190,861	$ 105,639
Billings in Excess of Costs, Costs	99,782	612,370
Costs in Excess of Billings, Estimated Earnings	54,721	34,611
Billings in Excess of Costs, Estimated Earnings	121,115	173,764
Costs in Excess of Billings, Costs and Estimated Earnings	245,582	140,250
Billings in Excess of Costs, Costs and Estimated Earnings	220,897	786,134
Costs in Excess of Billings, Amounts Billed	(146,295)	(75,104)
Billings in Excess of Costs, Amounts Billed	(405,911)	(834,345)
Cost and Profit in Excess of Billings	99,287	65,146
Billings in Excess of Cost	$ (185,014)	$ (48,211)